Improvement in apparatus for coating metal plates



E. MOREWOODQ APPARATUS FOR COATING METAL-PLATES.

Patented Jan. 4, 1876.

N- FETUS, PHOTD UTNVOGRAPMEE WASHINGTON. D Q

UNITED; STAT-Es PATENT Q I E.

EDMUND MoREwooD, or LLANELLY, GREAT BRITAIN.

IMPROVEMENT m APPARATU FOR .COATING METAL PLATES.

Specification formingpart of Letters Patent N 0. 171,685, dated J anuary 4, I876; application filed -e v r November 8,1875. v

CASE A.

To all whom it may concern:

Be it known that I, EDMUND MOREWOOD, ofLlanelly, in the county of Oarmarthen, Great Britain, formerly of Stratford, in the county of Essex, Englandfhave invented certain Improvements in Coating Metals, and in -apparatus to be used therefor, of which the. following is a specification:

In the process of coating iron with tinor terne metal, on the withdrawal of the plates from the first tinning or coating pot, and also when they are passed on rapidly through and from the wash or dipping pot','the temperature of the coated plate, especially if it be a thick one, is hotterthan is'well for finishingthrough the finishing-rollers if merely dropped into the finishing grease-pot and passed out through one pair of rollers, as is themode heretofore adopted. Further, in finishing with one pair of rollers in the finishing greasepot, as heretofore practiced, unless the rolling be repeated a second time the coated surface is not as fine and free from defects as is "de- -'Sirable. 1

The object of this invention-is to remedy these defects, and at the same time to expedite and cheapen the process or manufacture; and inorder that this my invention may be fully understood, I will now proceed to describe section of same. 1

I place two or more pairs of roller, 11 b and d 6, one above the other in the finishing grease or oil pot A, so that the coated plate in rising perpendicularly out of the grease passes in succession through these pairs of rollers- The upper rollers are about half immersed in the grease, as is well understood, and I make each pair capable of adjustment, as is well known, so that I may be able to exert such a pressure on the plate as shall lessen orimprove its surfacacoating. Ifiud in practice that a suitable pressure will also raise the plates through the rollers. The rollers are geared together, and driven in any usual and suitable way. I, by preference, use three rollers abreast, a b c,

A as'here shown, revolving in the finishinggrease, one object being that theplates introduced hot from the coating-metal may furnish a portion of heat to the rollers betweenwhich.

metal when the plate enters hot from the coating-metal pot through the rollers into the grease, and to finish and improve the coating when the plate passes out after beingcooled by its travel through the grease. All therollers are to be perfectly coated with the coatinglneta'l. I fimi in practice that the rollers are generally kept coated withrmetal bythemere action of the plates passing down through them into the grease as the superfluous metal is left on the rollers 11 and c, and thence by frictional contact carried to the roller a; but wheuI wish to give a heavier coating than usual, or when I drop the plate into the greasepot direct, and pass it through the elevatingrollers 01 e and a b only, then I feed the upper rollers, by preference to and b, with melted coating-metal by means of a ladle or otherwise: I may heat one roller of each pair by making it hollow and introducing hot air. I then may make the other roller of each. pair movable by causing it to work in-connection with a spring, or with such an arrangement grease between these rollers one side of a plate first touches the heated roller of the lower pair, and then the other side that of the upper pair; and the plate is acted upon first on one side and then on the other by p rollers at a temperature above that of the average of the grease; or I obtain a result in some degree equivalent by introducing a tube with cold water passing through it, or other arrangement, as a means of keeping the grease cooler in most parts than about the rollers. In such case I apply heat to the exterior of the grease-pot, but I aim to keep the line of travel of the plate through the grease before it reaches the exit-rollers coolthat is, cooler than the plate as it comes from the coating-pot. In regular working the rollers are to some extent kept hot ,bythe passage of the hot plates passingin succession between them from the pot or pots of melted coating-metal.

When I work. thus the coated plateenters the grease-potbetween the roller 0 on the entrau ce side and the center one b, and ,by their revolution is carried downward and dropped into a rack or apparatus in the grease-pot, and-is raised by suitable machinery into the opening between the center roller b and the exit-roller a, or the one against which the plate did not f enter. The entrance-rollers and the center roller b receives some heat from contact with the hot entering-plate, and the center roller b communicates some, heat to the exit-roller a by revolving against it and touching it; but if I desire to give it more I do so by making the roller hollow and applying hot airto it. With the same object of transferring'heat and coating-metal from the plate to the rollers, I may i use twopairs of rollers abreast instead of three rollers. a In such case one pair carry the plate down the other pair bring itup. Other arrangements of rollers may be employed than herein shown and described, my-object being toreduce the coating when the plate is hot,

H and to finish and improve the surface when it has been somewhat cooled by the grease, and cooledto a greater extentthan heretofore. I

may make one part of the bottom of the grease pot lower than the other, as showuat a:, so

that the coating-metal which drops from the rollers may flow to one side. I apply heat so as to keep such coating-metal fluid, and from i the lowest part of the grease-pot a tnhe,f, rises, and through this tube anyei rcessof metal can be removed by means of a can or a other appliance with as little disturbance to a the grease as may be. I also arrange so-that this tube shall be kept at or abovethe melting point of the metal which has to be withdrawn through it. h h i j is the lifting and tilting rack,,consisting mainly of oneor more bars, h, a cross-bar, i, at the bottom, and an attachment or connectionat the top j for raising it by mechanical or other power. It also has tilting guides and rests for theplate in pro-' cess of finishing, and a tilting appliance therefor. h I areherethe two sides of the rack,

in the bottom eyes 1 of which the cross-bar l 'i can turn. This cross-bar has fixed to it guides and rests k, on and, against which; the

plate can-rest and lean. l is a lever also fixed on the cross-bar i, and by pulling or depressing the rod m connected thereto the plate is tilted over to the position shown 'in dotted lines, so as to be directly under the center line between. the rollers 11 and e, the plates then standing on stationary bars 8, between which the guides and rests k can passythe whole rack or apparatus is theu'raised by hand-power, or as here shownj,:.where the strap n, attached tojthe cradle-topfpasses ov ra revolvingpulley, o, and is awn up by it when the workman pulls QthehandIe p. The a rack must'be suitablyguidedand steadied in its upward and downward movements. Any

other suitable appliance forbringingthe plate into the rollers may be used. q and riare guides for confining thetravel of the plate in the desired direction.

Iclaimk- Y 1. The entrancerollers cb,in combination withtwo or morepairsof exitrollers, baand d e, the upper pair being over the lowerpair',

and placed horizontally so as to be adapted to receiving between them a supply of melted coating-metal, substa ti l y and for mm purposes set forth. i i a t l t 2. The grease-potA, constructed a tube or passage, f, communicating with; a lower part, as, of said grease-pot, substantiallytas and. for the purpose set forth;

a 3. The rackh 'ij, with plate-rest and tiltiug appliance k In, in combination with grease pot and rollers, as set forth, and operating substantially. asset forth. e L EDMUNDMOREWOOD.

Witnesses a E. G. BREWER, W. F. WARREN. 

